Glue spreader



Patented 17,' 1939 UNITED STATES PATENT OFFICE anni spammen.

^ Eugene G. Daley, Riishville, Ind., assigner to Chas. E. Francis o.,Rushville, Ind., a corporation of Indiana Application May 9, 193s, sensiNo. 206,734

Claims.

In applying my invention to an applicatorl member in the form of a roll,I form the glueapplying roll, or at least-the outer portion thereof,

l5 of some resilient material such, for example, `as

soft rubber. In the cylindrical surface of such resilient material Iprovide` a multiplicity of recesses or pockets adapted to convey glue tothe work, and I force such roll against the work with a .force suicientto compress the resilient material at the surface of`the roll andthereby to reduce the effective volume of the recesses. De-

sirably, the recesses in the surface of the glueapplying roll are in theVform of longitudinally extending grooves triangular in cross-sectionand closely spaced so that the ribs of resilient material betweenadjacent grooves will also be generally triangular in section.

The accompanying drawing illustrates my invention: Fig. 1 is afragmental elevation of a portion f a glue-spreading machineillustrating one of my improved glue-applying rolls in contact with aboard; Fig. 2 is aside elevation of a roll embodying my invention; Fig.3 is a fragmental longitudinal section of the roll illustrated in Fig.2; and Fig. 4 is a fragmental transverse section of a niodied form ofroll.

In this application, I have not attempted to illustrate details of thecomplete glue-spreading machine, for the construction of such machinesis well known. See, for example, the machine illustrated in myco-pending application Serial No. 206,735, filed May 9, 1938. In such amachine, a glue-applying roll III rotates in contact with a supply ofglue to become coated therewith, and

a scraper bar or doctor roll (not shown) is associated with theglue-applying roll to regulate the thickness of the glue-lm retained bythe applicator roll and carried on its surface to its point of contactwith the work. As indicated in Fig. 1, the work is in the form of aboard II supported from beneath on a second roll I2 which may or may notbe used for the purpose of applying glue to the lower surface of theboard.

'I'he glue-applying roll is formed of, or at least has an annularcovering I3, of resilient material such as soft or cushioned rubber; andin the outer surface of this resilient material the roll is providedwith a multiplicity of recesses or pockets, here shown in the form ofgrooves Il approxil mately triangular in cross-section. These groovesare preferably closely spaced so as to leave between them ribs or ridgesI5 which are also approximately triangular in cross-section. K

In the vuse of a roll such as has been described. 10

the grooves I4 become filled with liquid glue as the roll rotates incontact with the glue supply, and such glue is carried in the grooves tothe point of contact with the board or other object to which it is to beapplied. 'I'he yglue-applying l roll is forced against the board II withsufilcient force to compress the ribs or ridges I5, s is clearlyindicated in Fig. 1. This radial compression of the ribs I5 results inan increase in their circumferential thickness which, in turn, 20

.causes a reduction in the cross-sectional area of the grooves Il overthat portion of the surface of the roll which is in contact with theboard/I I. The reduction in the cross-sectional area of the grooves Ilplaces the glue therein under a con- 25 siderable pressure causing itforcibly to enter the pores of the board.

The hydrostatic pressure generated as the grooves I4 are reduced involume tends not only to force theglue into the pores of the board, but30 also tends to cause it to flow longitudinally of the grooves. Withthick, viscous glues, the resistance to longitudinal ow may be so greatthat only a small proportion of the glue will be displacedlongitudinally of the roll. With less 35 viscous glues, however, it maybe necessary to control longitudinal ilow. One means for accomplishingthis end is illustrated in Figs. 2 and 3 where the continuity of thegrooves Il is interrupted at intervals along the roll by annular un- 40grooved portions I6. The face of each of such ungrooved portions,engaging the face of the board II, effects a seal preventing glue withinthe grooves I4 from escaping longitudinally of the roll.

- Another method of preventing longitudinal glue-flow in the grooves I4is illustrated in Fig. 4 where, instead of providing an ungroovedportion I6 between axially spaced groups of grooves, the grooves inadjacent groups are staggered so that 50 each groove I4 of one group isclosed at its ends vby a rib I5 on an adjacent group.

My invention is susceptible to considerable modication over and abovethat specifically indicated. The proportions and shapel of the 55grooves may vary considerably; but I prefer to use the approximateproportions indicated in the drawing where each of the ribs Il hasapproximately the same cross-sectional area as each of the grooves Il.

I claim as my invention:

1. In a glue-spreading machine. an applicator roll having aglue-applying face of resilient material provided with longitudinalgrooves of restricted cross-sectional area, a work-support. and meansfor forcing said roll against work on said work-support with suiiicientforce to compress the resilient material between said grooves andthereby reduce the cross-sectional area of the grooves.

2. The invention set forth in claim 1 with the addition that saidgrooves are arranged in axially spaced groups, the grooves of each groupbeing discontinuous with the grooves of any adjacent group.

3. II lne invention set forth in claim 1 with the addition that saidgrooves are arranged in axially spaced groups, the grooves of each groupbeing staggered relatively to the grooves of the adjacent group orgroups.

4. The invention set forth in claim 1 with the addition that saidgrooves are arranged in axially spaced groups, each group of groovesbeing separated from an adjacent group by an ungrooved portionof theroll-face.

5. In a glue-spreading machine, an applicator roll having aglue-applying face of resilient material provided with a multiplicity ofrecesses, a work-support, and means for forcing said roll against workon said work-support with sumcient force to compress the resilientmaterial between said recesses and thereby reduce the EUGENE G. DALEY.

volume of the recesses.

